Interpenetration of solids

[petrasv]

I modelised 2 plastic solids which deform quiet a lot. My problem is that in the solution the two solids interpenetrate which is physically impossible. In fact I don't know if it is possible to avoid the interpenetration for two surfaces not in contact before applying the force.

 

[ShaggyPE]

If one part penetrates the other during the solution, chances are they were constrained incorrectly when you set up the simulation. I believe with the use of node to node contact, even parts that have gaps prior to loading will act correctly. Do some searches in Cosmos help for "contact", "node to node", and "surface contact".

 

[cbrn]

Hi,
unfortunately there is no way to operate on the parameters used by Cosmos/Works during the contact solution.
If two surfaces compenetrate, probably they weren't included in the contact pair's set. In a large deformation analysis, very often you don't know which surfaces will come into contact unless you first run a "first-try" solution: then, adjust the contact pairs accordingly: include also the surfaces that weren't initially in contact, but don't use the "node-to-node" option, rather use the most general contact option possible (it will be enourmously slower, but accurate.
Regards